Initial bug doc entry

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+# Bugs and Glitches
+
+These are known bugs and glitches in the original Pokémon Emerald game: code that clearly does not work as intended, or that only works in limited circumstances but has the possibility to fail or crash.
+
+Fixes are written in the `diff` format. If you've used Git before, this should look familiar:
+
+```diff
+ this is some code
+-delete red - lines
++add green + lines
+```
+
+## Contents
+
+- [RNG does not get seeded](#rng-does-not-get-seeded)
+
+
+## RNG does not get seeded
+
+**Fix:** Add the following function to [src/main.c](https://github.com/pret/pokeemerald/blob/master/src/main.c):
+```diff
++static void SeedRngWithRtc(void)
++{
++	u32 seed = RtcGetMinuteCount();
++	seed = (seed >> 16) ^ (seed & 0xFFFF);
++	SeedRng(seed);
++}
+```
+
+And edit `AgbMain`:
+
+```diff
+	...
+	RtcInit();
+	CheckForFlashMemory();
+	InitMainCallbacks();
+	InitMapMusic();
++	SeedRngWithRtc();
+	ClearDma3Requests();
+	...
+```
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